Presented is a circuit device for driving an a.c. electric load, incorporating a rectifying bridge that has a first input connected to one terminal of the electric load and a second input connected to an outlet of an a.c. main supply. The rectifying bridge has output terminals connected to a power switch...http://www.google.ca/patents/US6256211?utm_source=gb-gplus-sharePatent US6256211 - Circuit device for driving an a.c. electric load
